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CBSE Class 12 Chemistry Sample Papers 2015 as per the latest revised marking scheme and question paper pattern issued by CBSE for class 12 chemistry is now available for free download in PDF file format at myCBSEguide.com.

## CBSE Class 12 Chemistry Sample Papers 2015

These sample question papers are prepared by our team of expert teachers. Class-12 Chemistry syllabus has some changes in marking scheme and question paper design. The new question paper for 2015 onwards, there will be 26 questions. Last year there was 30 questions in all.

**Download CBSE Class 12 Chemistry Sample Papers for 2015**

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is any body tell me about rault’s law

If you have a solution of volatile liquid,then the vapour pressure exerted by each gas is directly proportional to their mole fraction.

By henry’s law

p1=p1(knot)x1

p2=p2(knot)x2

By rault’s law,P(total)=p1+p2

=p1(knot)x1+p2(knot)x2

=p1(knot)x1+p2(knot)(1-x1) [since x1+x2=1]

then just simplify it a bit more to obtain the formula.